Do I have to be the hero? Eye candy sounds easier, I think I'll take that job. Then Medaka can be the hero, and I'll just kick back while she levels up the party and gets us kick-ass items -- good times. Anyone else in the party would be overkill, but I'll play along.

Saaya would be excellent to look at and all, but I would end up with Lucy in the end through the help of Klein constantly throwing in some good words for me like the ultimate bro he is. I shall develop high level esper skills with the help of Komoe-sensei, and Katsura as our resident boke will gladly throw us off track in a display of Mansai exchange at all the right and wrong moments.

Heroine/Support-Lucy from Elfen Lied, she'd just go psycho and kill everyone
Bro4Life-Hijikata from Gintama, We'd just be chillin' in the back row, having a smoke watching the others kill everyone
Wise Mentor-The Giant Lion-Turtle from Avatar the Last Airbender, I dunno why, it's just awesome
Eye Candy-Tsukuyo from Gintama
Comic Relief-Katsura from Gintama